create a function and explain why it is a function using academic vocabulary (input ,output, mapping, vertical line test and function (

An example would be using points
(0,0)(1,2)(7,14)(10,20)

it is a function because each input has only one input.

or

using the vertical line test none of the points are on the same line

X= 49; x = 4step 1: foilstep 2: equal both to 0step 3: find x individually